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The 'Diarmuid Gavin approach' to antenna design

  • 01-02-2006 2:13pm
    #1
    Zaphod
    Registered Users, Registered Users 2 Posts: 1,733 ✭✭✭


    Spot the difference!


    chelseaSLx.jpg

    vs

    sph30a2.jpg


    More info here


Comments

  • #2
    Sparky
    Registered Users, Registered Users 2 Posts: 22,231 ✭✭✭✭Sparky


    interesting design alright, but by the looks of it, he needs some web design skills also :D


  • #3
    andrew3
    Closed Accounts Posts: 57 ✭✭andrew3


    Just remembered a quote Adam sandlers "Anger management" --
    hooker1 - I like it when there big
    hooker2 - I prefer them when there enourmous!

    I have to agree with hooker2 -- who wants tiny!!


  • #4
    Ulsterman 1690
    Closed Accounts Posts: 1,242 ✭✭✭Ulsterman 1690


    How do these things work
    30cm 48dB
    29 cm 47dB
    25cm 50dB
    22cm 52dB
    20cm 51dB
    15cm 51dB

    Sounds too good to be true

    Mind you if it does work it could be a godsend for the "I live in an apartment/private estate/listed building etc and the landlord/managment company/council/local grupfurher wont let me put up a dish" types


  • #5
    Zaphod
    Registered Users, Registered Users 2 Posts: 1,733 ✭✭✭Zaphod


    The theory behind them is here. Dr Dish aired a promo video for a Japanese version a few months back.


  • #6
    Ulsterman 1690
    Closed Accounts Posts: 1,242 ✭✭✭Ulsterman 1690


    Interesting although Id like to see some reviews from people who have tried them


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  • #7
    Ulsterman 1690
    Closed Accounts Posts: 1,242 ✭✭✭Ulsterman 1690


    Sparky-s wrote:
    interesting design alright, but by the looks of it, he needs some web design skills also :D

    Nice pictures but poor layout and nothing in the way of price lists or ordering/shipping/payment details :rolleyes:

    If his products are as good as he claims he should be able to make a fortune though

    EDIT: Actually reading through the site again I see the guy is actually a designer rather than selling the things but he is looking for a company to manufacture them


  • #8
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 93,596 Mod ✭✭✭✭Capt'n Midnight


    Don't they usually use polystyrene foam for lenses ?

    Could you make your own out of old packing and a ball to fit it in ?


  • #9
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    Think more a Malteser. It needs different layers or variable density polystyrene etc.

    It needs to have a granularity of the plastic or layers of less than 3mm to aviod distorting the image, Imagine a glass lens made of broken glass or powder, it wouldn't work. Irregularities need always to be about 1/10th wavelength or less, this is why C band mesh dish don't work for Ku band.


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